Cutter



N0v.25,193o.` 7s. G.. MAARTN j 1,783,023

CUTTER y l Filed Sept, 25,' 1923 2 sheets-Sheet 1 A ,5 A, 34 Z0 Q6 q rf r- 35\\' .2 u J0 I N8 "f2 `25 SAHUEL G. MARTIN, F WEST SOMERVILLE, llllfAssAcHUsETTs, ASSIGNOR T0 'I'.HllllV Patented Nov. 25,y 1930 f UNITED STATES PATENT oFElcE BARRETT COMPANY, ACORPORATION 0F NEW JERSEY CUTTER Application led September 25, 1923. Serial No. 664,667.

This invention relates to a device for cutting a long strip of material into predetermined lengths. It relates more particularly' to cutting thin, narrow strips of metal such as galvanized iron, into uniform lengths for tying bundles of shingles or the like.

By this invention strips of different sorts may be automatically cut into uniform lengths without requiring close attention on the part of the operator and when lengths of different sorts are to be cut, the device can be readily altered so as to obtain straps of the' desired length all of which will e substantially uniform while the device is set for cutting straps of that particular length. The invention will be understood from the description in connection with the drawings in which,

Figure 1 is a side view of the device;

Fig. 1a is a detail of the pull rolls and the actuating mechanism therefor;

Fig. 2 is a plan view of Fig. 1;

Fig. 3is a detail showing the knife and its operating mechanism;

Fig. 4 is a side view of a modification;

Fig. 5 is a plan view of Fig. 4;

Fig. 6 is a detail showing the pull rolls;

Fig. 7 is a detail showing the cutter; and F ig.v 8 is a detail showing the knife carrier.

In the drawings, reference characters l and 2 indicate a number of continuously operable pull rolls that are mounted so as to be in Contact with each other. One of these rolls 2 may be mounted in the housing 3 which slides in a guide 4 and a spring 5 is provided for pressing the roll' 2 toward the roll 1. The roll 2 is carried on a'shaft 6 which is provided with a driving motor 7 or a pulley that has a belt passing thereover from any convenient source of power, not shown. The roll 1 may be carried by the shaft 8 which may have a lgear 9 on the end thereof meshing with the 'Ijhe shaft 15 carries a wheel 18 upon the periphery of which may be mounted one or more strikers 19, thepurpose 0f which will be explained below.

Aguide 20 extends from near the roll 1 and!" is provided with al groove 21 along its upper surface through which the strip is to be fed. A s rocket wheel 22 is mounted upon the sha t 6 and a shaft 25 which is parallel withI the .shaft 6 carries a corresponding Sprocket 24: which is driven by means of the sprocket chain 23. The shaft 25 carries a continuous-- ly rotatable drive feed roll 26 which is slightly larger in diameterthan the feed roll 1 so:

that the periphery thereof will travel at a faster rate of speed thanthe peripher of the feed roll 1. A continuously rotatab e pressure roll 27 is mounted in the housing belowthe roll'26 and is pressed upwardly thereagainst by means yof the spring 28. Thus rolls 26and 27 are gethe'rand are adapte to sli on the material when the feed thereof is o structed by the' cutter 30 hereinafter described.

A bed plate 29 is located just beyond the pull roll 26 and aknife or cutter 30 is provided to cooperate therewith to sever the material at the proper moment. The knife 30 is pivoted at 31 and a spring 32 under the other end thereof tends to keep the same in its raised position.

The operation is' as follows: The strip of material to be cut into redetermined lengths is first wound upon t e roll 33 and the end of the strip is passed between the feed rolls 1 and 2 which are being driven by the motor 7. The operation of the feedv rolls causes the strip to pass along the groove 21 in the guide 2O and its end then passes between the rolls 26 and 27 and over the bed plate 29 whereupon the revolution of the wheel 18 will cause the striker19 to Contact with the end of the knife 30 causing the same to descend and cut ofi' the strip. It will be noted that when the strip is of some width the knife 30 will be so mounted with respect to the bed plate 29 that the strip will be gradually severed beginning at one edge and extending `thereacross. During the time that the strip is being severed by the knife Ico 30 the portion between the feed roll 1 and feed roll 26 will buckle as indicated by the dotted line 34 due to the excess material fed during 'the cutting operation; this excess material is held in place by the guide 21 and rolls Q6 and 27, but as soon as the striker 19 has )assed beyond the knife 30, the spring 32 raises the knife and the end of the strip is free to move forward whereupon the feed roll 26, revolving at a higher peripheral speed than the pull roll 1, will take up the slack by the time the knife 30 descends again. `It. will be seen that the length of the portions cut o' from the strip 33 will depend upon the number of times the knife 30 is caused to descend in proportion to the rate at which the material is being fed and this proportion can readily be altered b changing the chain drive 17 on the sproc vets 14 and 16 or by providing a different number of strikers 19 on the wheel 18.

In the modification shown in Figs. 4 and 5, feed rolls 39 and 40 are provided, the roll 40 being mounted in the housing 43 that is pressed downwardly by means of the spring 44. The feed roll $39 is mounted on a shaft 41 which is driven -by a motor or pulley 4Q. The shaft 41 carries a series of sprockets 45 and a sprocket chain 46 from one of the sprockets may drive one of a series of sprockets 47 mounted on a shaft 48 which is parallel to the shaft 41. The shaft 48 carries a striker 49.

A knife carrier 50 is mounted in the guide 51 and is provided with springs 52 to tend to maintain the same in an elevated position. The top 'of the carrier 50 is provided with a buffer 53 and is also provided with an extension 54 which carries a revoluble roll 55. rIlhe knife carrier 56 carries a knife 56 which is attached to the carrier 50 by means of the bolt 57 extending through the slot 58. The lower end 59 of the knife 56 may be beveled as indicated so as to cut the material gradually from one edge to the other as the knife is made to descend. A guide 60, provided with a groove 61, extends from the roll 39 to the knife carrier and its end 62 is provided with a sharpened edge to cooperate With the knife 59. An auxiliary guide 63 is provided above and near the rear end of the guide 61.

The operation of this mo'diication'is similar tothe one described above. This modification is particularly adapted to the cutting of material that is resilient since the resilient material will buckle above the guide 61 and be retained in place by the guide 63 during the descent of the cutter and when the cutter is raised by a spring 52, the resiliency of the material will cause the same to move forward sufficiently during the intervals between the cutting operations. It is obvious that instead of having the striker 49 operate more rapidly by shifting the chain drive 46, a plurality of strikers 49 may be mounted upon the shaft 48 thus causing the cutter to descend a greater number of times in proportion to the amount of material fed. The shifting of the chain drive obviously might necessitate the use of chains of different lengths.

W'hile the rolls 1 and 6 are referred to as pull rolls in the specification, it will be understood that these rolls function to pull the material from the supply roll and thus rolls 1 and 6 constitute a feeding device for feeding the material from the supply roll towards the cutter 30.

I claim:

1. In a cutter, means for continuously feeding a strip of flexible strap-making material, a cutter, means for intermittently operating said cutter at various time intervals to stop and to cut the strap-making material and a guide between said cutter and feeding means adapted to permit the strap ma terial to buckle when the material is stopped by the cutter.

2. In a cutter, means for continuously feeding a strip of fiexible strap-making material, a cutter, means for intermittently operating said cutter to stop and to cut the strap-making material, a guide between said cutter and feeding means adapted to permit the strap material to buckle when the material is stopped by the cutter and rotatable means for feeding the material at an increased rate of speed between cutting operations.

3. In a device for cutting a long strip of material into predetermined lengths, pull rolls, a cutter, connections between said pull rolls and cutter whereby the frequency of operation of said cutter with respect to said rolls may be varied, and feed rolls located between said first named pull rolls and said cutter adapted to be continuously driven at ay higher peripheral speed than that of said pull rolls and to slidably grip said material,

4. ln a strip cutter, a continuously operable feeding device, a cutter for momentarily stopping and cutting said strip, a guide be tween said cutter and feeding means adapte( to permit the strip to buckle when the strip is stopped and continuously rotatable means located between said feeding device and said cutter adapted to take up the slack in the strip caused by the buckling of said strip when it is stopped by the cutter.

5. ln a strap cutter, in operable succession, continuously operable pull rolls for feeding a strip of material, continuously rotatable feed rolls ofgreater peripheral speed than thel first named rolls adapted to slidably grip said strip, and an intermittently operable cutter.

6. In a strap cutter, in operable succession, continuously operable pull rolls for feeding a strip of material, continuously rotatable feed Til rolls of greater peripheral s eed than the rst named rolls adapted to sli ably grip said strip, an intermittently operable cutter for stopping and cutting said strip material, and connections between said pull rolls and cutter whereby the frequenc of operation of the cutter with respect to t e rollsmay be varied.

In testimony whereof I aiiix my signature.

SAMUEL G. MARTIN. 

